code: def test_sep_in_char_set(self):
      normsep = os.path.normcase("\\") == os.path.normcase("/")
      check = self.check_match
      check("/", r"[/]")
      check("\\", r"[\]")
      check("/", r"[\]", normsep)
      check("\\", r"[/]", normsep)
      check("[/]", r"[/]", False)
      check(r"[\\]", r"[/]", False)
      check("\\", r"[\t]")
      check("/", r"[\t]", normsep)
      check("t", r"[\t]")
      check("\t", r"[\t]", False)
  
imports: import unittest
  import os
  import string
  import warnings
  from fnmatch import fnmatch, fnmatchcase, translate, filter
label_desc: Use image node_id 11 for calling the FnmatchTestCase obj's underlying member method code with example usage: obj.test_sep_in_char_set() without return types